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Front are easy to access, rear is the same but very tight. Remove plastic engine cover. The Northstar engine uses a coil pack that is directly over the spark plugs. It is right up front on top of the engine. It is held on by approx. 9 screws. Unscrew these and unplug the coilpack. spark plugs are located in the four holes in front of you. Same for rear of engine, just a little harder to get to.
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